How to Choose a Drone Motor & Propeller Size One of the most posed questions is what motor and propeller size do I use for my Drone or Quadcopter. Well, the answer is not a straight forward simple one but know what all the numbers mean will help. Lets first take a look at the number on a brushless motor. Brushless Drone Motor Size and kV Numbers Motor Size - The first numbers on a brushless Drone motor have to do with the rotor size. This is usually a 4 digit number like 2206 or 2306. The first 2 numbers ("22"...